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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00ecda4c624b5b69269d367d65999f0bacc81f77965a82d90a681fbb53acd1eb' 
  AND token = '6r4NWtxe+17mb8u/7h4tZhPq8R7Jq7BxBmdKa4pVbuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}